Air-compressor.



No. 697,4I4 n v Patented Apr.. 8, 1902.

` F. L. REEDER &. A. B.` FREVILLE.

AIR COMPRESSOR,

(Application filed Feb. 6, 1901.)

UNITED STATES PATENT OFFICE.

FRANK L. REEDER AND ALBERT FREVILLE, OF LOUISVILLE, KENTUCKY, ASSIGNORSTO THE NATIONAL FOUNDRY AND MACHINE COMPANY, OF LOUISVILLE, KENTUCKY, ACORPORATION.

AIR-COMPRESSOR SPECIFICATION forming part of Letters Patent No. 697,414,dated April 8, 1902.

.Application tiled February 6, 1901. Serial No. 46,203. (No model.) i

To all whom, t may concern: Be it known that we, FRANK L. REEDER anALBERT B. FREVILLE, citizens of the United States, and residents ofLouisville, in the 5 county of Jefferson and State of Kentucky,

have made a certain new and useful Invention in Air-Compressors; and wedeclare the following to be a full, clear, and exact description of thesame, such as will enable others 1o skilled in the art to which itappertains to make and use the invention, reference being had t theaccompanying drawings, and to characters of reference markedthereomwhich form a part of this specification.

Figure lis a central vertical section through our air-compressor. Fig. 2is a section on kthe line Fig. 1, the bushing B being removed from thelower valve-chamber. Fig. 3 is van enlarged detail section of one of thevalve-- zo chambers and valves therein.

This invention has relation to air-compress' ors, and has for its objectthe improvement of the valve mechanism thereof with a view to increasedsimplicity and compactness, avoiding leakage, increased capacity for acylinder of given dimensions, regulation of the lift of the valves,`dac.

With this object in view the invention consists in the novelconstruction and combina- 3o tion of parts, all as hereinafterdescribed, and

pointed ou-t in the appended claims.

Referring to the accompanying drawings, the letter A-designates theair-cylinder, having piston A, piston-rod A2, and provided with formingan integral part of such cylinder and directly connected with the endportions thereof by short air-passages a of a length equal to thethickness of the cylinder-shell at such points and having aright-angular relation to the axes of such cylinder and chambers. Thesevalve-chambers are at their upper ends, by passages X X, connected witheach other and with passage Y, providing a common exit for the air.

In chambers B are bushings or valve-cages B', having a taperingscrew-threaded engagement b therewith and open at both ends thereof,such bushings projecting from the cham- 5o bers and having jam-nuts Cengaging the prothevalve-chambers B, one at each end thereof,

jecting end portions of the bushings and provided each with awrench-seat extension C',

a space c separating thev inner wall of each said nut from the outerwall of the bushing, air-admission ports c being providedin the end Wallof the main portion of each said nut and communicating through space cwith the interior of the valve-cages, and air-admission ports being alsoprovided in the end wall of said nut extension.

The valve-bushin gs communicate at the inner ends thereof with passagesX X and at their opposite ends with the air-admission ports aforesaidand are provided intermediately thereof with'perforations c2, communi-65' eating with passages a through annular grooves c3 in the inner wallsof the valvechambers. The bushings are formed with valve-seats c4 at theouter side ofthe perfo;

rations c2, valves c5 seating thereupon to con- 7e trol the admission ofair to the cylinder, and at their inner extremities said bushings areformed with valve-seats c6, back-pressure valves cT seating thereuponand having their lift limited by screw-plugs o8, engaging per- 7 5forations in the end walls of the valve-chambers. Thesevalves c5 and c?are of tapered disk form and have -radial -guide-iianges cg workingclosely in saidbusningawhich are of larger internal diameter at theirinner end 8o portions to allow of the insertion of the outer valves, thelift of the outer said valves being limited by the guide-fiangcs of theinner said valves.

' In the operation of-theinvention'u'pon the S5 `downstroke of thepiston valve c5 at thev lower end of the cylinder will close to itsseat, cutting 0E admission of air, and its companion valve c7 will opento allow egress of the air in the cylinder, which passesthrough shortpas- 9o sage a into annular groove c3, through perforations c2 into theinterior of the valve-bushing, the valves at the upper end of thecylinder having a reversed action to admit air through the -perforationsin the jam-nut, through perforations c2 of the valve-bushing intoannular groove c3, and passage ot to the cylinder.

The tapering screw-threaded engagement of the valvebushings and theirchambers in roo connection with the jam-nuts for said cages admits of aslight variation in the comparative diameter of bushings and chambers atsuch points withoutinterfering with the tight character of the joint.The jam-nuts also serve the purpose of guarding against leakage of airthrough the joints between valve bushings and chambers. The lift of theinner valves may be regulated by the screwplugs in case of variation inthe length of the bushings.

Referring to the steam side of our pump, the numeral l indicates thesteam-cylinder; 2, the piston thereof; 3, the steam-chest, and 4 and 5the induction and eduction passages, respectively, of steam to and fromthe cylinder.

G is a balanced piston slide-valve reciprocating in the steam-chest, ofhollow cylindrical form throughout, the interior of which valve is inconstant communication with the passage 4 at 4:, having steam-ports at 77 in alternate communication with lpassages S 8 to admit steam to thecylinder, the chamber 6 in the lower wall of which valve is in alternatecommunication with passages 8 Sto exhaust steam from the cylinderthrough passage 5, with which said chamber 6 is in constantcommunication. 9 is a pin engaging groove 9 of such valve to preventturning thereof, and ports are provided at both sides of said Valve, sothat no matter which way it is inserted in place there will be noblocking of induction-passage 4. l

In each end wall of the piston-valve 6 is a steam-port 6" to passage 6,extending downwardly into communication with a cylindrical chamber l0,extending longitudinally of the cylinder at one side of thesteam-induction passage 4, said ports Gb being controlled in thevertical engine shown by valves carried by flat springs secured to thevalve end walls. Reciprocating in the said chamber l0 is a cylindricalvalve-rod l1, having passage 1l alternately connecting passages 6c withpassages l0 l0, leading from eduction-passage 5 into chamber 10. Thisvalve-rod is reciprocated by means of short intermediately-pivotedlevers 12 12, having the working arms thereof acting against the endwalls of such rod and the power-arms thereof extended downwardly andprojecting through the end walls of the cylinder to a slight extent inthe path of the moving piston when it has about completed the stroke.

The taper threaded engagement of Valve chamber and bushing allowsadjustment for a tight fitto prevent back pressure of the air, while thejam-nut'forms an adjustable joint between the cylinder and theatmosphere, the adjustment of the two joints beingindependcnt of cachother.- The screw-plug engages a perforation in the end wall of theValvechamber, thereby providing a passage entirely through said chamberin a straight line, which is convenient for cleaning and other purposes.

Having thus described our invention, what We claim as new, and desire tosecure by Letters Patent, is

1. In an air-compressor, the combination with the taper threadedvalve-chamber, having an annular interior groove, and a passageconnecting chamber and cylinder, of a taperthreaded double, valve-seatbushing, having a projecting threaded end portion, the valves in saidbushing, the perforated jam-nut engaging said projecting portion of thebushing, and the threaded plug engaging a threaded opening in the endwall of the valve-seat chamber, substantially as specified.

2. An air-compressor having valve-chambers at each end of the cylinderthereof, and having passages connecting each end of the cylinder withsaid chambers, and having a passage connecting said chambers, saidchambers having each an interior annular groove registering with thepassage connecting chamber and cylinder, and integral double valveseatbushings having a tapered threaded engagement with said chambers, saidbushings having perforations registering with said interior grooves, andhaving portions thereof projecting from the chambers, the valves in saidbushings and jam-nuts engaging said projecting portions of the bushingsand having air-inlet perforations, substantially as specified.

3. An air-compressor having valve-chambers at each end of the cylinderthereof, and having passages connecting each end of the cylinder withsaid chambers, and having a passage connecting said chambers, saidchambers having each an interior annular groove registering with thepassage connecting chamber and cylinder, and integral double valveseatbushings having a tapered threaded engagement with said chambers, saidbushings having perforations registering with said interior grooves, andhaving portions thereof projecting from said chambers, the valves insaid bushings, jam-nuts engaging the projecting portions of saidbushings, and having air-inlet perforations, and screw-plugs engagingperforations of the end walls of said chambers, substantially asspecified.

In testimony whereof we aix our signatures in presence of two witnesses.

FRANK L. REEDER. ALBERT l5. FREVILLE. Witnesses F. M. LosEY, CHARLES H.FREVILLE.

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